EP0681896B1 - Trennverfahren für Teppichböden - Google Patents
Trennverfahren für Teppichböden Download PDFInfo
- Publication number
- EP0681896B1 EP0681896B1 EP19950102872 EP95102872A EP0681896B1 EP 0681896 B1 EP0681896 B1 EP 0681896B1 EP 19950102872 EP19950102872 EP 19950102872 EP 95102872 A EP95102872 A EP 95102872A EP 0681896 B1 EP0681896 B1 EP 0681896B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- suspension
- liquid phase
- stage
- value
- density
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
- B03B5/28—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
- B03B5/30—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions
- B03B5/32—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions using centrifugal force
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
- B03B5/28—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
- B03B5/30—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions
- B03B5/44—Application of particular media therefor
- B03B5/442—Application of particular media therefor composition of heavy media
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/02—Separating plastics from other materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/02—Separating plastics from other materials
- B29B2017/0203—Separating plastics from plastics
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/02—Separating plastics from other materials
- B29B2017/0213—Specific separating techniques
- B29B2017/0217—Mechanical separating techniques; devices therefor
- B29B2017/0224—Screens, sieves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/02—Separating plastics from other materials
- B29B2017/0213—Specific separating techniques
- B29B2017/0217—Mechanical separating techniques; devices therefor
- B29B2017/0231—Centrifugating, cyclones
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/02—Separating plastics from other materials
- B29B2017/0213—Specific separating techniques
- B29B2017/0217—Mechanical separating techniques; devices therefor
- B29B2017/0237—Mechanical separating techniques; devices therefor using density difference
- B29B2017/0244—Mechanical separating techniques; devices therefor using density difference in liquids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2021/00—Use of unspecified rubbers as moulding material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/10—Polymers of propylene
- B29K2023/12—PP, i.e. polypropylene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2029/00—Use of polyvinylalcohols, polyvinylethers, polyvinylaldehydes, polyvinylketones or polyvinylketals or derivatives thereof as moulding material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2031/00—Use of polyvinylesters or derivatives thereof as moulding material
- B29K2031/04—Polymers of vinyl acetate, e.g. PVAc, i.e. polyvinyl acetate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2077/00—Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2313/00—Use of textile products or fabrics as reinforcement
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/732—Floor coverings
- B29L2031/7322—Carpets
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Definitions
- the invention relates to a method for largely single-variety Separation of used carpets, preferably of polyamide tufting carpet materials, in three main components.
- the invention relates to hydrodynamic sorting of shredded carpet materials.
- a tufted carpet essentially exists from pile fibers from polyamide-6 or polyamide-6,6 or also from Polyethylene terephthalate or polybutylene terephthalate, further from a carrier material or tufting base made of polypropylene and / or Natural fiber fabric and from a carpet back with inorganic Fillers of synthetic or natural rubber, especially with Chalk-filled styrene-butadiene-latex foam, or a back made of polypropylene or natural fiber.
- FR-A 2 301 362 describes a method according to the carpet material is cut into pieces of 20 - 25 mm in the dry phase by Treatment of the pieces with water of the carpet backs embrittled that Fibers sheared off and the suspension in a cone spinner into a wet latex foam fraction that is discarded and a fiber fraction, which is processed into needle felt or fleece after dewatering, is separated.
- WO-A 94-01219 discloses a double-cone screw centrifuge a conical sieve section for separating old plastic mixtures in the form of coarse pieces, foils or granules. Because of there is a risk of blockage of the screen holes due to fiber agglomerates this centrifuge is not very suitable for the separation of fibrous material.
- DE-A 29 26 233 also discloses polymer-containing mixtures of substances, after suspension in a suitable liquid Disassemble using hydrocyclones. Usually in the hydrocyclone turbulent flow conditions prevail, the separation effect is strong depends on the particle shape, distribution and size. While to For example, good results with shredded polyester bottle waste achieved are fibrous wastes including carpet wastes hard to separate this way.
- the object of the present invention is therefore to create a physical process for the separation of carpet materials in three main components, which have a significantly higher purity and Yield of the components enables than the known methods or separators.
- the inventive method is suitable for working up any Synthetic fiber carpet materials, preferably with tufted carpets Pol fibers made of polyamide 6, polyamide 6,6, polyethylene terephthalate or Polybutylene terephthalate including its low modified ones Copolymers and a carrier fabric made of polypropylene and a Carpet back made of synthetic material mixed with inorganic fillers Rubber, usually styrene-butadiene-rubber foam filled with chalk.
- the carpet materials to be separated are first cut into pieces or Strips mechanically pre-shredded, this measure only to do so serves the feeding of the subsequent fine comminution device to enable.
- the fine grinding takes place in a commercially available Cutting mill or other equivalent cutting device, whereby to avoid sticking due to thermal stress in liquid phase with the addition of water and / or recycled aqueous Saline solution is worked.
- the particles are discharged from the fine comminution device over a perforated plate with holes that have a diameter in the range of 3 to 10 mm, preferably 5 to 8 mm.
- the cut individual particles lie in the aqueous suspension almost uniform in material, d. that is, each of the individual particles is made up essentially either from pile fibers or from carrier fabric or from Carpet backing, but not from combinations of these components.
- the aqueous suspension is conveyed into a storage container with an agitator.
- the solids concentration of the suspension is simultaneously reduced to a value in the range from 1 to 15% by weight, preferably 3 to 10% by weight, and the density of the liquid phase of the suspension to a value which is preferably between highest and the second highest density of the main carpet components.
- the density can also be set to a value which lies between the lowest and the second lowest density of the main components.
- the specific heaviest carpet component is usually due to the filler the carpet back with a density of the order of 2.0 kg / dm 3 .
- the second heaviest component is the pile fibers with a density of about 1.35 kg / dm 3 for polyethylene terephthalate, about 1.31 kg / dm 3 for polybutylene terephthalate and about 1.15 kg / dm 3 for polyamide-6 and -6.6. Accordingly, in the preferred procedure, the density of the liquid phase of the suspension is in the range from about 1.35 to about 1.50 kg / dm 3 for polyester fibers and in the range from 1.16 to about 1.30 for polyamides kg / dm 3 set (at 20 ° C).
- the density is adjusted with simultaneous adjustment of the solids concentration with the aid of an aqueous salt solution, preferably calcium chloride or potassium carbonate, the concentration of the salt solution being higher, the higher the density to be adjusted and the lower the reduction in the solids concentration to be made.
- an aqueous salt solution preferably calcium chloride or potassium carbonate
- the density (at 20 ° C.) of an aqueous solution with a concentration of 30% by weight is approximately 1.28 kg / dm 3 and of 40% by weight at about 1.4 kg / dm 3 and that of a 50% by weight aqueous K 2 CO 3 .1.5 H 2 O solution at 1.54 kg / dm 3 .
- the aqueous salt solution is expediently prepared in the form of a stock solution with a defined density in a separate salt dissolving unit.
- the addition of small amounts of less than 0.2 g / l of a commercially available wetting agent and / or defoamer is recommended.
- more than 90% by weight of the heavier fraction consists of synthetic rubber mixed with mineral fillers, in addition to small amounts of fiber material.
- the density of synthetic rubber is on the order of only about 1.0 kg / dm 3
- the carpet backing is due to the good distribution and the large amount of filler, for example chalk with a density of about 2.7 kg / dm 3 Component but to be found quantitatively in this material flow.
- this fraction can be reused as a filler in a thermal power station or after further processing steps.
- the liquid phase consisting of aqueous salt solution is in the Salt solution unit returned, if necessary after concentration according to the salinity of the stock solution.
- the water evaporated from the saline solution also enters the process recycled, preferably in the fine grinding device, wherein only that discharged as residual moisture with the solid fractions Share must be supplemented by fresh water.
- the Fine comminution device instead of water also aqueous salt solution be fed.
- the lighter solid fraction essentially consists of the other two main components and is referred to below as the intermediate fraction.
- This intermediate fraction is suspended in a further storage container with a stirrer in water and / or aqueous saline solution and the density of the liquid phase is set to a value which lies between the densities of the two main components forming the intermediate fraction.
- one of these two main components consists of polypropylene, the density of which is around 0.90 kg / dm 3 .
- the density of the liquid phase is adjusted by means of an aqueous salt solution.
- the suspended intermediate fraction is in another double-cone solid-bowl screw centrifuge into a solid fraction with a higher density than the liquid phase and with a solid content a lower density than the liquid phase as well as in a liquid Phase separated.
- the Residual moisture of the two solid fractions in the range from 2 to 15 % By weight.
- the former of these solid fractions consists of one Degree of recovery of over 90% by weight to over 95% by weight from pile fibers, in addition to small amounts of base fabric and carpet backing.
- This faction can be fed directly to a depolymerization plant, in of the monomers on which the fibers are based. Because of their small amount, the accompanying substances (carrier tissue and Carpet backing and possibly adhering salt) the depolymerization process hardly, in particular, no additional reactor volume needed, and the reaction residue is compared to the procedures of the prior art low. Alternatively, this fraction can post preceding drying in the melting phase processed into moldings will.
- the other solid fraction consists of over 95% by weight of carrier fabric, mostly polypropylene, in addition to very small amounts of pile fibers and Carpet backing. Because the polypropylene during the carpet separation process not exposed to any significant thermal and / or chemical stress , this polypropylene can be easily dried after drying recycled in the needled or fiber area or are marketed as granules.
- the liquid phase mostly water, is used again to suspend the Intermediate fraction used. A possible excess can be in a previous process stage can be traced.
- the density of the liquid phase of the aqueous suspension of the finely comminuted carpet material can alternatively also be set to a value which lies between the lowest and the second lowest density of the main components.
- the specifically lightest main component consists of polypropylene and the second lightest of the pile fibers, so that a density of the liquid phase of approximately 1.0 kg / dm 3 is recommended.
- the carpet material is finely comminuted with the supply of only water, which is then supplemented by further water in the storage container up to a solids concentration in the range from 1 to 15% by weight.
- a fraction consisting of more than 95% by weight of polypropylene and an intermediate fraction consisting of the two other main components and a liquid phase consisting of water are obtained.
- the intermediate fraction is, as described above, suspended in water or aqueous salt solution and the density of the liquid phase is adjusted to an intermediate value with aqueous salt solution, which in the case of pile fibers made of polyamides ranges from 1.16 to about 1.30 kg / dm 3 and at those made of polyester is in the range from about 1.35 to about 1.50 kg / dm 3 .
- the suspension is then separated by means of a double-cone solid-bowl screw centrifuge into a fraction consisting of over 95% by weight of pile fibers and a fraction consisting of over 90% by weight of carpet backing and a liquid phase consisting of aqueous salt solution.
- the process according to the invention is preferably carried out continuously Ambient temperature.
- a discontinuous way of working is possible, with the suspension and separation of the intermediate fraction in those already used for the previous process stages Aggregates, namely the storage container and the double-cone solid-bowl screw centrifuge, can be done.
- the emerging suspension is pumped into a storage container provided with a stirrer and mixed with 300 kg of an aqueous stock solution containing 40.0% by weight CaCl 2 .2H 2 O and 0.1 g / l wetting agent.
- the suspension is then a double-cone solid-bowl screw centrifuge given up.
- the heavier carpet back fraction dry 17.5 kg
- the intermediate fraction dry 12.5 kg
- the intermediate fraction is agitated in a second one Storage container entered and suspended in 255 kg of water.
- This Suspension is a second double-cone solid bowl screw centrifuge given up.
- the pile fiber fraction (dry 11.0 kg) is with a residual moisture content of about 10% by weight and the carrier fabric fraction (dry 1.5 kg) with a residual moisture content of about 5% by weight.
- the separated solid fractions based on dry matter, have the following composition: Components Pol fiber fraction Carrier fabric fraction Carpet back fraction polyamide 96% by weight 1% by weight 5% by weight Polypropylene 2% by weight 98% by weight 1% by weight Chalk-containing styrene-butadiene latex 2% by weight 1% by weight 94% by weight
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Description
Polyamid-6-Fasern | 40,0 Gew.-% |
Polypropylen-Trägergewebe | 5,0 Gew.-% |
Schaumrücken aus kreidehaltigem Styrol-Butadien-Latex (Kreideanteil 62 Gew.-%) | 55,0 Gew.-% |
Komponenten | Polfaser- Fraktion | Trägergewebe- Fraktion | Teppichrücken- Fraktion |
Polyamid | 96 Gew.-% | 1 Gew.-% | 5 Gew.-% |
Polypropylen | 2 Gew.-% | 98 Gew.-% | 1 Gew.-% |
Kreidehaltiger Styrol-Butadien-Latex | 2 Gew.-% | 1 Gew.-% | 94 Gew.-% |
Claims (10)
- Verfahren zur Auftrennung von vorzerkleinerten Teppichmaterialien in drei Hauptkomponenten, wobeia) eine wäßrige Teppichsuspension durch Feinzerkleinerung in wäßriger Phase erzeugt wird, wobei in der Suspension die Konzentration an Teppichmaterial 5 bis 50 Gew.-% und die Partikelgröße 3 bis 10 mm beträgt,b) die Dichte der flüssigen Phase der Suspension aus Stufe a) durch Zugabe einer wäßrigen Salzlösung auf einen Wert eingestellt wird, der zwischen den Dichten von zwei Hauptkomponenten mit benachbarten Dichten liegt, wobei gleichzeitig die Konzentration an Teppichmaterial in der Suspension auf einen Wert im Bereich von 1 bis 15 Gew.-% abgesenkt wird,c) die Suspension aus Stufe b) in einer Doppelkonus-Vollmantel-Schneckenzentrifuge in eine im wesentlichen aus einer Hauptkomponente bestehende Fraktion und eine im wesentlichen aus den beiden anderen Hauptkomponenten bestehende Zwischenfraktion sowie eine flüssige Phase aufgetrennt wird,d) die Zwischenfraktion aus Stufe c) in einer wäßrigen Phase suspendiert und die Dichte der flüssigen Phase dieser Suspension auf einen Wert eingestellt wird, der zwischen den Dichten der beiden die Zwischenfraktion bildenden Hauptkomponenten liegt, wobei gleichzeitig die Konzentration an Teppichmaterial in der Suspension auf einen Wert im Bereich von 1 bis 15 Gew.-% eingestellt wird,e) die Suspension aus Stufe d) in einer Doppelkonus-Vollmantel-Schneckenzentrifuge in zwei, jeweils im wesentlichen aus nur einer Hauptkomponente bestehende Fraktionen sowie eine flüssige Phase aufgetrennt wird,f) die abgetrennten, im wesentlichen aus jeweils nur einer Hauptkomponente bestehenden Fraktionen der individuellen Weiterverwertung und die flüssigen Phasen der prozeßinternen Wiederverwendung zugeführt werden.
- Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, daß in mindestens einer der Stufen a) und d) die wäßrige Phase Wasser ist.
- Verfahren gemäß Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Suspension der Stufe a) 10 bis 30 Gew.-% und die der Stufen b) und d) 3 bis 10 Gew.-% Teppichmaterial mit einer Partikelgröße im Bereich von 5 bis 8 mm enthalten.
- Verfahren gemäß einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Hauptkomponenten des Teppichmaterials Polfasern aus Polyamid-6 oder Polyamid-6,6 sowie Polypropylen und mit Kreide gefüllter, synthetischer Kautschuk sind, und die Dichte der flüssigen Phase der Suspension in einer der Stufen b) oder d) auf einen Wert im Bereich von 1,16 bis 1,30 kg/dm3 und in der anderen der Stufen b) oder d) auf einen Wert von etwa 1,0 kg/dm3, gemessen bei 20 °C, eingestellt wird.
- Verfahren gemäß einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Hauptkomponenten des Teppichmaterials Polfasern aus Polyethylenterephthalat oder Polybutylenterephthalat sowie Polypropylen und mit Kreide gefüllter synthetischer Kautschuk sind, und die Dichte der flüssigen Phase der Suspension in einer der Stufen b) oder d) auf einen Wert im Bereich von etwa 1,35 bis 1,50 kg/dm3 und in der anderen der Stufen b) oder d), auf einen Wert von etwa 1,0 kg/dm3 (gemessen bei 20 °C) eingestellt wird.
- Verfahren gemäß einem der Ansprüche 4 oder 5, dadurch gekennzeichnet, daß die wäßrige Salzlösung Kaliumcarbonat oder Calciumchlorid sowie weniger als 0,2 g/l eines Benetzungsmittels und/oder Entschäumers enthält.
- Verfahren gemäß einem der Ansprüche 4 oder 5, dadurch gekennzeichnet, daß die Fraktionen der Stufe f) zu über 90 Gew.-% aus mit Kreide gefülltem, synthetischem Kautschuk, bzw. zu über 95 Gew.-% aus Polypropylen, bzw. zu über 95 Gew.-% aus Polfasern bestehen, jeweils bezogen auf Trockenmasse.
- Verfahren gemäß Anspruch 7, dadurch gekennzeichnet, daß die Polypropylen-Fraktion nach der Trocknung zu Granulat, Fasern oder Nadelvliesen verarbeitet wird und die Polfaser-Fraktion zu wiederverwendbaren Monomeren depolymerisiert wird.
- Verfahren gemäß einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß in Stufe b) die Dichte der flüssigen Phase der Suspension auf einen Wert eingestellt wird, der zwischen der höchsten und der zweithöchsten Dichte der Hauptkomponenten liegt, und in Stufe c) eine im wesentlichen aus der spezifisch schwersten Hauptkomponente bestehende Fraktion abgetrennt wird.
- Verfahren gemäß einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß in Stufe b) die Dichte der flüssigen Phase der Suspension auf einen Wert eingestellt wird, der zwischen der niedrigsten und der zweitniedrigsten Dichte der Hauptkomponenten liegt, und in Stufe c) eine im wesentlichen aus der spezifisch leichtesten Hauptkomponente bestehende Fraktion abgetrennt wird.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4416466A DE4416466A1 (de) | 1994-05-10 | 1994-05-10 | Trennverfahren für Teppichböden |
DE4416466 | 1994-05-10 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0681896A1 EP0681896A1 (de) | 1995-11-15 |
EP0681896B1 true EP0681896B1 (de) | 1998-08-05 |
Family
ID=6517770
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19950102872 Expired - Lifetime EP0681896B1 (de) | 1994-05-10 | 1995-03-01 | Trennverfahren für Teppichböden |
Country Status (3)
Country | Link |
---|---|
US (1) | US5598980A (de) |
EP (1) | EP0681896B1 (de) |
DE (2) | DE4416466A1 (de) |
Families Citing this family (35)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5855981A (en) | 1994-02-09 | 1999-01-05 | Collins & Aikman Floorcoverings, Inc. | Process of recycling waste polymeric material and an article utilizing the same |
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-
1994
- 1994-05-10 DE DE4416466A patent/DE4416466A1/de not_active Withdrawn
- 1994-12-15 US US08/356,688 patent/US5598980A/en not_active Expired - Lifetime
-
1995
- 1995-03-01 DE DE59503045T patent/DE59503045D1/de not_active Expired - Fee Related
- 1995-03-01 EP EP19950102872 patent/EP0681896B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
US5598980A (en) | 1997-02-04 |
DE4416466A1 (de) | 1995-11-16 |
DE59503045D1 (de) | 1998-09-10 |
EP0681896A1 (de) | 1995-11-15 |
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